Pressure sensitivity would be great for use with the Apple Pencil.
But at least for now you can use the Pencil as a very fine tip stylus for making fine, clear adjustments where your finger would otherwise not do or be in the way.
At least on the XS Max.
What is entertaining is that when Steve Jobs mentioned how we are going to interact with iPhone and he mentions mouse, stylus and then reveals finger, oddly enough there is mouse support in iOS 13 via accessibility.